Global Patent Index - EP 0328825 A3

EP 0328825 A3 19900725 - METHOD FOR FORMING A TORUS AND A PISTON MADE THEREFROM FOR USE IN A ROTARY ACTUATOR

Title (en)

METHOD FOR FORMING A TORUS AND A PISTON MADE THEREFROM FOR USE IN A ROTARY ACTUATOR

Publication

EP 0328825 A3 19900725 (EN)

Application

EP 88311885 A 19881215

Priority

US 15788788 A 19880219

Abstract (en)

[origin: EP0328825A2] A method of forming a finished torus of precise dimension which can be used to form piston segments for use in a rotary actuator (10) in which a torus workpiece (40) is rigidly mounted on a support (60) in such a manner as to leave a first hemi-toroidal surface (42) of the torus workpiece (40) exposed, the support (60) being mounted on a suitable means to rotate the torus workpiece (40) about a fixed axis (A) passing through the center of the torus workpiece, the first hemi-toroidal surface (42) of the torus workpiece (40) being turned with a circular cutting tool (T) by moving the cutting tool (T) in a semi-circular path across the first hemi-toroidal surface (42) of the torus workpiece (40), then flipping over the torus workpiece (40) and mounting it on the support (60) while leaving a second hemi-toroidal surface (44) of the torus workpiece (40) exposed and once again moving the cutting tool (T) in a semi-circular path across the second hemi-toroidal surface (44) of the torus workpiece while the torus workpiece (40) and support (60) are rotated about the center axis (A) of the torus to thereby produce a finished torus of second, smaller dimension. In forming pistons for use in a rotary actuator, the finished torus is cut into desired segments (S) to form at least one piston segment.

IPC 1-7

B23B 5/00

IPC 8 full level

B23B 5/00 (2006.01); B23B 5/36 (2006.01); B23P 13/02 (2006.01); F01C 21/08 (2006.01)

CPC (source: EP KR US)

B23B 5/365 (2013.01 - EP US); F01C 21/08 (2013.01 - EP US); G05B 19/18 (2013.01 - KR); Y10T 29/49989 (2015.01 - EP US); Y10T 82/10 (2015.01 - EP US); Y10T 82/148 (2015.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

AT DE FR GB IT NL SE

DOCDB simple family (publication)

US 4817213 A 19890404; AU 2756188 A 19890824; AU 600614 B2 19900816; BR 8900711 A 19891017; EP 0328825 A2 19890823; EP 0328825 A3 19900725; JP H01234102 A 19890919; KR 890013393 A 19890922; KR 890013536 A 19890923; KR 910007053 B1 19910916; MX 166515 B 19930113; NZ 227580 A 19910625

DOCDB simple family (application)

US 15788788 A 19880219; AU 2756188 A 19881229; BR 8900711 A 19890217; EP 88311885 A 19881215; JP 2773789 A 19890208; KR 890000424 A 19890117; KR 890001634 A 19890213; MX 1491289 A 19890213; NZ 22758089 A 19890110